First thing is to buy your pineapple.
Secondly, slowly start picking of the greens on the bottom to expose the roots.
Third put it in water and be patient as the roots will come.
Here's a photo of another one I've been growing in just water. Look at these roots. Thank you for viewing.
Here it is. My very first one I grew in water, now in pot. Growing, going on 6 months. Thanks for viewing.